BlueNote is a nice graphic processing tool. Image processing application focused on mathematical morphology. Unique functionality: filters by reconstruction, multiple structuring element, granulometry, geodetic transformations, hit-and-miss.

Mathematical morphology is a theory and technique for the analysis and processing of geometrical structures, based on set theory, lattice theory, topology, and random functions.
Mathematical morphology is most commonly applied to digital images, but it can be employed as well on graphs, surface meshes, solids, and many other spatial structures.

BlueNote Features:
1. filters by reconstruction
2. multiple structuring element
3. granulometry
4. geodetic transformations
5. hit-and-miss

The license of this software is Free, you can free download and free use this image processing software.